Pneumatic tyre for two-wheeled vehicles

Abstract

A pneumatic tyre for a two-wheeled vehicle includes at least one carcass ply. Each cord of the at least one carcass ply identifies a radial plane of the tyre passing through an intersection point of the cord with an equatorial plane of the tyre, and lies in a lying plane substantially perpendicular to the equatorial plane of the tyre and forming a lying angle different from zero with a respective radial plane. A pair of tyres each includes a predetermined rolling direction. The lying planes are oriented so that if the respective radial plane is fixed in position and the lying plane is rotated about the intersection point toward the respective radial plane through the lying angle, then the lying plane is superimposed on the respective radial plane and the direction of that rotation is the same as (front tyre) and the opposite of (rear tyre) the predetermined rolling direction.

1 - 21 . (canceled)  
   
   
       22 . A pneumatic tyre for a two-wheeled vehicle, comprising: 
 a carcass structure;    a belt structure;    a tread band; and    a pair of sidewalls;    wherein the carcass structure comprises: 
 at least one carcass ply;  
   wherein the at least one carcass ply comprises a plurality of cords disposed substantially parallel to each other,    wherein the at least one carcass ply is shaped in a substantially toroidal configuration,    wherein ends of the at least one carcass ply are engaged with respective circumferential annular reinforcing structures,    wherein the belt structure is disposed at a radially external position relative to the carcass structure,    wherein the tread band is disposed at a radially external position relative to the belt structure,    wherein the sidewalls are disposed on laterally opposite sides relative to the carcass structure, and    wherein each cord of the at least one carcass ply: 
 identifies a radial plane of the tyre passing through an intersection point of the cord with an equatorial plane of the tyre; and  
 lies in a lying plane substantially perpendicular to the equatorial plane of the tyre and forming a lying angle different from zero with a respective radial plane.  
   
   
   
       23 . The tyre of  claim 22 , wherein each cord of the at least one carcass ply crosses the equatorial plane of the tyre, forming an angle of substantially 90° with respect to the equatorial plane of the tyre.  
   
   
       24 . The tyre of  claim 22 , wherein the belt structure comprises: 
 a layer comprising a plurality of circumferential coils;    wherein the circumferential coils are disposed in axial side-by-side relationship, and    wherein the circumferential coils are spirally wound at a substantially zero-degree angle relative to the equatorial plane of the tyre.    
   
   
       25 . The tyre of  claim 24 , wherein the circumferential coils comprise steel cords, and 
 wherein in a stress-deformation diagram, the steel cords demonstrate a behavior having a percent elongation greater than 0.4%, with a load lower than 5% with respect to a tensile strength of the steel cords.    
   
   
       26 . The tyre of  claim 25 , wherein the percent elongation of the steel cords is greater than or equal to 0.5% and less than or equal to 4%.  
   
   
       27 . The tyre of  claim 22 , wherein the carcass structure comprises only one carcass ply.  
   
   
       28 . The tyre of  claim 22 , wherein the carcass structure comprises: 
 a first carcass ply; and    a carcass half-ply;    wherein the carcass half-ply is associated with the first carcass ply.    
   
   
       29 . The tyre of  claim 22 , wherein a first layer of elastomer material is interposed between the carcass structure and the belt structure.  
   
   
       30 . The tyre of  claim 29 , wherein the first layer comprises short aramidic fibres.  
   
   
       31 . The tyre of  claim 22 , wherein a second layer of elastomer material is interposed between the belt structure and the tread band.  
   
   
       32 . The tyre of  claim 31 , wherein the second layer comprises short aramidic fibres.  
   
   
       33 . The tyre of  claim 22 , wherein a first layer of elastomer material is interposed between the carcass structure and the belt structure, and 
 wherein a second layer of elastomer material is interposed between the belt structure and the tread band.    
   
   
       34 . The tyre of  claim 33 , wherein the first layer comprises short aramidic fibres, and 
 wherein the second layer comprises short aramidic fibres.    
   
   
       35 . The tyre of  claim 22 , wherein the at least one carcass ply comprises a plurality of strip elements, and 
 wherein each strip element comprises at least one cord.    
   
   
       36 . The tyre of  claim 22 , wherein each annular reinforcing structure comprises: 
 a first annular insert; and    a second annular insert;    wherein the first annular insert is axially external to a first carcass half-ply, and    wherein the second annular insert is axially external to a second carcass half-ply.    
   
   
       37 . The tyre of  claim 36 , wherein each annular reinforcing structure comprises: 
 a first filler of elastomer material;    wherein the first filler of elastomeric material is axially external to the first annular insert.    
   
   
       38 . The tyre of  claim 36 , wherein each annular reinforcing structure comprises: 
 a second filler of elastomer material;    wherein the second filler of elastomeric material is axially external to the second annular insert.    
   
   
       39 . The tyre of  claim 37 , wherein each annular reinforcing structure further comprises: 
 a second filler of elastomer material;    wherein the second filler of elastomeric material is axially external to the second annular insert.    
   
   
       40 . The tyre of  claim 28 , wherein each annular reinforcing structure comprises: 
 a first annular insert; and    a second annular insert;    wherein the first annular insert is axially external to the first carcass ply, and    wherein the second annular insert is axially external to the carcass half-ply.    
   
   
       41 . The tyre of  claim 22 , wherein the tyre comprises a predetermined rolling direction, 
 wherein the tyre is designed to be mounted as a front tyre of the two-wheeled vehicle, and    wherein the lying plane is oriented so that if the respective radial plane is fixed in position and the lying plane is rotated about the intersection point of the cord with the equatorial plane of the tyre toward the respective radial plane through the lying angle, then the lying plane is superimposed on the respective radial plane and the direction of that rotation is the same as the predetermined rolling direction.    
   
   
       42 . The tyre of  claim 22 , wherein the tyre comprises a predetermined rolling direction, 
 wherein the tyre is designed to be mounted as a rear tyre of the two-wheeled vehicle, and    wherein the lying plane is oriented so that if the respective radial plane is fixed in position and the lying plane is rotated about the intersection point of the cord with the equatorial plane of the tyre toward the respective radial plane through the lying angle, then the lying plane is superimposed on the respective radial plane and the direction of that rotation is the opposite of the predetermined rolling direction.    
   
   
       43 . The tyre of  claim 22 , wherein the lying angle is greater than about 1 degree and less than about 12 degrees.  
   
   
       44 . A pair of pneumatic tyres for a two-wheeled vehicle, comprising: 
 a front tyre; and    a rear tyre;    wherein each tyre comprises: 
 a carcass structure;  
 a belt structure;  
 a tread band; and  
 a pair of sidewalls;  
   wherein the carcass structure comprises: 
 at least one carcass ply;  
   wherein the at least one carcass ply comprises a plurality of cords disposed substantially parallel to each other,    wherein the at least one carcass ply is shaped in a substantially toroidal configuration,    wherein ends of the at least one carcass ply are engaged with respective circumferential annular reinforcing structures,    wherein the belt structure is disposed at a radially external position relative to the carcass structure,    wherein the tread band is disposed at a radially external position relative to the belt structure,    wherein the sidewalls are disposed on laterally opposite sides relative to the carcass structure,    wherein each cord of the at least one carcass ply: 
 identifies a radial plane of the tyre passing through an intersection point of the cord with an equatorial plane of the tyre; and  
 lies in a lying plane substantially perpendicular to the equatorial plane of the tyre and forming a lying angle different from zero with a respective radial plane,  
   wherein each tyre comprises a predetermined rolling direction,    wherein for the front tyre, the lying plane is oriented so that if the respective radial plane is fixed in position and the lying plane is rotated about the intersection point of the cord with the equatorial plane of the tyre toward the respective radial plane through the front tyre lying angle, then the lying plane is superimposed on the respective radial plane and the direction of that rotation is the same as the predetermined rolling direction, and    wherein for the rear tyre, the lying plane is oriented so that if the respective radial plane is fixed in position and the lying plane is rotated about the intersection point of the cord with the equatorial plane of the tyre toward the respective radial plane through the rear tyre lying angle, then the lying plane is superimposed on the respective radial plane and the direction of that rotation is the opposite of the predetermined rolling direction.    
   
   
       45 . The pair of tyres of  claim 44 , wherein the front tyre lying angle has substantially a same magnitude as the rear tyre lying angle.